@article{Guan2025, 
author = {Sitao Guan and Yang Zhao and Wenqing Wei and Hengdong Ren and Yuxiang Yan and Xinglong Wu},
title = {Rapid synergistic multi-polarization losses enable efficient micro-/terahertz-wave absorption and shielding in WO3-based 1T/2H-MoSe2 in-plane heterojunctions},
year = {2025},
journal = {Nano Research},
volume = {18},
number = {9},
pages = {94907720},
keywords = {electron injection, electromagnetic wave absorption/shielding, in-plane heterojunctions, multi-polarization losses},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94907720},
doi = {10.26599/NR.2025.94907720},
abstract = {The rapid development of microwave-terahertz frequency band technologies has created an urgent demand for broadband electromagnetic wave absorption materials. In this study, a heterostructured composite comprising mixed-phase 1T/2H-MoSe2 (002) and WO3 (200) nanosheets was constructed to realize efficient electromagnetic wave absorption and shielding across both microwave and terahertz frequency bands. In the microwave region, the 1T/2H-MoSe2/WO3 absorber exhibits a minimum reflection loss of −66.62 dB at 14.98 GHz with a thickness of 1.77 mm, attributed to slow polarization relaxation induced by multiple interfaces and structural defects. In the terahertz range, the system delivers a dominant shielding effectiveness of 67.3 dB at 1.31 THz with a thickness of 2 mm. This performance arises from the precise alignment of the Fermi level of metallic 1T-MoSe2 with the conduction band of WO3 at the interface, enabling rapid electron injection into WO3 with oxygen vacancies via electrochromism. This process induces the transition from W(VI)–O to W(VI−)–O, thereby enhancing both electronic and ionic polarization losses. When incorporated into polyvinyl alcohol (PVA) and fabricated into films, the resulting 500-μm-thick (1T/2H-MoSe2)/WO3/PVA composite film achieves a maximum shielding effectiveness of 71.51 dB in the 0.2–1.8 THz frequency range, demonstrating excellent practical applicability.}
}